Oil seal cavity pressure reduction structure for screw compressor

Abstract

The oil seal cavity pressure reduction structure comprises an oil seal cavity seat, a connecting shaft and a servo motor, the end portion of the oil seal cavity seat is connected with a sealing cover seat through an installation bolt, a pressure gauge is installed at the upper end of the sealing cover seat, a protective cover is fixed on the side face of the sealing cover seat, and the connecting shaft is connected with the servo motor. A cover cap is installed at the upper end of the protective cover, a connecting shaft is installed in the middle of the oil seal cavity seat, an abutting ring is fixed to the inner end of the oil seal cavity seat, an oil seal plate is arranged on the side of the abutting ring, a servo motor is fixedly installed in the protective cover, and a rotating shaft is fixed to the output end of the servo motor. A first bevel gear is fixed to the bottom of the rotating shaft. According to the oil seal cavity pressure reduction structure for the screw compressor, through the use of a mechanical pressure reduction structure, when the internal pressure is too large, one end of the movable shaft can be moved to the outer end of the sealing cover seat, so that the purpose of pressure reduction is achieved, and the oil seal cavity pressure reduction structure is easy to use, mechanized in the whole process and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field related to screw compressors, in particular to an oil seal cavity pressure reduction structure for a screw compressor. Background Art

[0002] Screw compressors have a simple structure, few wearing parts, can operate at a low exhaust temperature under large pressure difference or pressure ratio conditions, are insensitive to large amounts of lubricating oil in the refrigerant, and have good gas flow regulation. They quickly occupied the use range of large-capacity reciprocating compressors and continued to extend to the medium-capacity range. They are widely used in refrigeration, cold storage, air conditioning, chemical processes and other refrigeration equipment. The oil seal cavity at the end of the screw compressor has a high pressure during the use of the compressor, which increases the risk of oil seal leakage. Therefore, it is necessary to reduce the pressure inside the oil seal cavity.

[0003] The existing publication number CN211202303U discloses an oil seal chamber pressure reduction structure for a screw compressor, which comprises a housing having an inner cavity penetrating the front and rear surfaces thereof, a main shaft received in the inner cavity, an oil seal sleeve and a sealing sleeve covering the main shaft in parallel, an oil seal covering the oil seal sleeve, an oil seal seat covering the oil seal and the oil seal sleeve, a spacer ring close to the housing and covering the sealing sleeve, and a bearing gland supporting the spacer ring and covering the main shaft;

[0004] The sealing sleeve in the above document has an interference fit with the inner cavity to reduce the pressure, but the oil often enters the labyrinth-shaped sealing groove, which is easy to cause the sealing groove to become blocked and has a short service life. Therefore, we propose a pressure reduction structure for the oil seal chamber of a screw compressor to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide an oil seal cavity pressure reduction structure for a screw compressor to solve the problems raised by the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an oil seal chamber pressure reduction structure for a screw compressor, comprising an oil seal chamber seat, a connecting shaft and a servo motor, the end of the oil seal chamber seat is connected to the cover seat by a mounting bolt, a pressure gauge is installed at the upper end of the cover seat, and a protective cover is fixed to the side of the cover seat, a cover is installed at the upper end of the protective cover, a connecting shaft is installed in the middle of the oil seal chamber seat, a retaining ring is fixed at the inner end of the oil seal chamber seat, and an oil seal plate is arranged on the side of the retaining ring, an oil seal barrel is fixed to the connecting shaft, a sealing plate is fixed at the inner end of the cover seat, a servo motor is fixedly installed inside the protective cover, and a rotating shaft is fixed to the output end of the servo motor, a first bevel gear is fixed to the bottom of the rotating shaft, a threaded sleeve is connected to the middle of the sealing plate, and a movable shaft is arranged inside the threaded sleeve, and a clamping hole is opened at the end of the cover seat.

[0007] Preferably, the surface of the oil seal plate is connected to the surface of the retaining ring via a fixing bolt, and the surface of the oil seal plate is mounted with an oil seal bearing connected to the connecting shaft via a rear locking pin.

[0008] By adopting the above technical solution, the inside of the oil seal cavity seat can be sealed through the oil seal plate and the oil seal bearing.

[0009] Preferably, the outer diameter of the oil seal barrel is equal to the inner diameter of the oil seal cavity seat, and a filter plate is arranged inside the oil seal barrel, and three groups of filter plates are arranged.

[0010] By adopting the above technical solution, the oil entering the interior can be filtered through the three groups of filter plates inside the oil seal barrel.

[0011] Preferably, the threaded sleeve is connected to the isolation plate by a bearing connection, and a second bevel gear meshing with the lower side of the first bevel gear is fixed on the surface of the threaded sleeve.

[0012] By adopting the above technical solution, the threaded sleeve can be easily rotated on the isolation plate, so that the first bevel gear can drive the threaded sleeve to rotate.

[0013] Preferably, the movable shaft is arranged in an "L" shape, the left end of the movable shaft is arranged in a threaded shape, and a clamping strip is fixed to the right end surface of the movable shaft, and the clamping strip is arranged in four groups.

[0014] The above technical solution is adopted to facilitate the sliding of the clamping strip at the end of the movable shaft on the clamping hole on the cover seat.

[0015] Preferably, the movable shaft and the threaded sleeve are connected in a threaded manner, and the right end of the movable shaft forms a snap-fit ​​sliding connection with a snap hole on the surface of the cover seat through a snap strip.

[0016] By adopting the above technical solution, the threaded sleeve can facilitate the threaded movement of the movable shaft so that the movable shaft can slide on the surface of the sealing seat.

[0017] Preferably, the middle portion of the movable shaft is hollow, and pressure relief holes are evenly arranged at the right end of the movable shaft.

[0018] By adopting the above technical solution, the pressure relief hole on the surface of the movable shaft can be used to discharge the internal pressure, so as to reduce the pressure inside the oil seal cavity.

[0019] Compared with the prior art, the beneficial effect of the utility model is that the oil seal chamber pressure reduction structure for the screw compressor can, through the use of a mechanical pressure reduction structure, move one end of the movable shaft to the outer end of the cover seat when the internal pressure is too large, so that the pressure relief hole located inside the oil seal chamber seat can be discharged to the outside, so that the internal pressure can be discharged outward, so as to achieve the purpose of pressure reduction. The utility model is simple to use, fully mechanized, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the movable shaft of the utility model;

[0023] Figure 4 This is a schematic diagram of the clamping hole structure of the utility model;

[0024] Figure 5 It is a schematic diagram of the movable shaft discharge structure of the utility model.

[0025] In the figure: 1. Oil seal chamber seat; 2. Sealing cover seat; 3. Mounting bolts; 4. Pressure gauge; 5. Protective cover; 6. Cover; 7. Connecting shaft; 8. Thrust ring; 9. Oil seal plate; 10. Oil seal bearing; 11. Locking pin; 12. Oil seal barrel; 13. Sealing plate; 14. Servo motor; 15. Rotating shaft; 16. First bevel gear; 17. Threaded sleeve; 18. Second bevel gear; 19. Movable shaft; 20. Pressure relief hole; 21. Clamping strip; 22. Clamping hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-5 The utility model provides a technical solution: an oil seal chamber pressure reduction structure for a screw compressor, comprising an oil seal chamber seat 1, a connecting shaft 7 and a servo motor 14, the end of the oil seal chamber seat 1 is connected to the cover seat 2 by a mounting bolt 3, a pressure gauge 4 is installed on the upper end of the cover seat 2, and a protective cover 5 is fixed on the side of the cover seat 2, a cover 6 is installed on the upper end of the protective cover 5, a connecting shaft 7 is installed in the middle of the oil seal chamber seat 1, a collar 8 is fixed on the inner end of the oil seal chamber seat 1, and an oil seal plate 9 is arranged on the side of the collar 8, and the oil seal plate 9 is provided with a plurality of The surface is connected to the surface of the collar 8 by a fixing bolt, and the surface of the oil seal plate 9 is installed with an oil seal bearing 10 connected to the connecting shaft 7 by a rear locking nail 11, and the inside of the oil seal cavity seat 1 can be sealed by the oil seal plate 9 and the oil seal bearing 10, and the connecting shaft 7 is fixed with an oil seal barrel 12, and the outer diameter of the oil seal barrel 12 is equal to the inner diameter of the oil seal cavity seat 1, and the inside of the oil seal barrel 12 is provided with a filter plate, and the filter plate is provided in three groups, and the oil entering the inside can be filtered by the three groups of filter plates inside the oil seal barrel 12;

[0028] See also Figure 1-5 A sealing plate 13 is fixed to the inner end of the sealing cover seat 2, a servo motor 14 is fixedly installed inside the protective cover 5, and a rotating shaft 15 is fixed to the output end of the servo motor 14, a first bevel gear 16 is fixed to the bottom of the rotating shaft 15, a threaded sleeve 17 is connected to the middle of the sealing plate 13, and the threaded sleeve 17 is connected to the sealing plate 13 in a bearing connection manner, and a second bevel gear 18 meshing with the lower part of the first bevel gear 16 is fixed on the surface of the threaded sleeve 17, which can facilitate the rotation of the threaded sleeve 17 on the sealing plate 13, so that the first bevel gear 16 drives the threaded sleeve 17 to rotate, and a movable shaft 19 is arranged inside the threaded sleeve 17, and the movable shaft 19 is arranged in an "L" shape, and the left end of the movable shaft 19 is arranged in a threaded shape, and the movable A clamping strip 21 is fixed to the right end surface of the shaft 19, and four groups of clamping strips 21 are provided to facilitate the clamping strip 20 at the end of the movable shaft 19 to slide on the clamping hole 22 on the cover seat 2. The end of the cover seat 2 is provided with a clamping hole 22. The movable shaft 19 is connected to the threaded sleeve 17 by a threaded connection, and the right end of the movable shaft 19 forms a clamping sliding connection with the clamping hole 22 on the surface of the cover seat 2 through the clamping strip 20, which can facilitate the threaded movement of the movable shaft 19 driven by the threaded sleeve 17 so that the movable shaft 19 can slide on the surface of the cover seat 2. The middle part of the movable shaft 19 is hollow, and the right end of the movable shaft 19 is evenly provided with pressure relief holes 20, which can facilitate the pressure relief holes 20 on the surface of the movable shaft 19 to discharge the internal pressure so as to reduce the pressure inside the oil seal cavity.

[0029] Working principle: First, when the internal pressure of the oil seal chamber seat 1 is relatively high, the servo motor 14 can be turned on to drive the rotating shaft 15 to rotate, so that the first bevel gear 16 at the end of the rotating shaft 15 meshes and rotates with the second bevel gear 18 on the surface of the threaded sleeve 17, so that the threaded sleeve 17 rotates on the sealing plate 13, and the threaded sleeve 17 is threadedly connected with the movable shaft 19, so that the end of the movable shaft 19 can slide on the clamping hole 22 on the surface of the cover seat 2 through the clamping strip 21, so as to facilitate the pressure relief hole 2 located on the surface of the movable shaft 19 inside the cover seat 2. 0 is discharged to the outside of the sealing cover seat 2, so that the pressure inside the oil seal chamber seat 1 is discharged through the hollow movable shaft 19 and the pressure relief hole 20, so as to relieve the pressure inside the oil seal chamber seat 1. When the pressure is released, the servo motor 14 can be reversed so that the threaded sleeve 17 drives the movable shaft 19 to reset, and the pressure relief hole 20 at the end of the movable shaft 19 is reset to the inside of the sealing cover seat 2, so as to seal the oil seal chamber seat 1, so as to use the oil seal chamber seat 1. This is the use principle of the oil seal chamber pressure reduction structure for the screw compressor.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil seal chamber pressure reduction structure for a screw compressor, comprising an oil seal chamber seat (1), a connecting shaft (7) and a servo motor (14), characterized in that: The end of the oil seal chamber seat (1) is connected to the sealing cover seat (2) by means of mounting bolts (3); a pressure gauge (4) is mounted on the upper end of the sealing cover seat (2); a protective cover (5) is fixed to the side of the sealing cover seat (2); a cover (6) is mounted on the upper end of the protective cover (5); a connecting shaft (7) is mounted in the middle of the oil seal chamber seat (1); a retaining ring (8) is fixed to the inner end of the oil seal chamber seat (1); an oil seal plate (9) is arranged on the side of the retaining ring (8); an oil seal barrel (9) is fixed to the connecting shaft (7); The cover seat (2) is provided with a body (12), a sealing plate (13) is fixed at the inner end of the sealing plate seat (2), a servo motor (14) is fixedly installed inside the protective cover (5), and a rotating shaft (15) is fixed at the output end of the servo motor (14), a first bevel gear (16) is fixed at the bottom of the rotating shaft (15), a threaded sleeve (17) is connected to the middle of the sealing plate (13), and a movable shaft (19) is arranged inside the threaded sleeve (17), and a clamping hole (22) is opened at the end of the sealing plate seat (2).

2. The oil seal chamber pressure reduction structure for a screw compressor according to claim 1, characterized in that: The surface of the oil seal plate (9) is connected to the surface of the retaining ring (8) via a fixing bolt, and the surface of the oil seal plate (9) is provided with an oil seal bearing (10) connected to the connecting shaft (7) via a rear locking pin (11).

3. The oil seal chamber pressure reduction structure for a screw compressor according to claim 1, characterized in that: The outer diameter of the oil seal barrel body (12) is equal to the inner diameter of the oil seal cavity seat (1), and a filter plate is arranged inside the oil seal barrel body (12), and three groups of filter plates are arranged.

4. The oil seal chamber pressure reduction structure for a screw compressor according to claim 1, characterized in that: The threaded sleeve (17) is connected to the sealing plate (13) in a bearing connection manner, and a second bevel gear (18) is fixed on the surface of the threaded sleeve (17) and is meshed with the lower part of the first bevel gear (16).

5. The oil seal chamber pressure reduction structure for a screw compressor according to claim 1, characterized in that: The movable shaft (19) is arranged in an "L" shape, the left end of the movable shaft (19) is arranged in a threaded shape, and a clamping strip (21) is fixed on the right end surface of the movable shaft (19), and the clamping strip (21) is arranged in four groups.

6. The oil seal chamber pressure reduction structure for a screw compressor according to claim 1, characterized in that: The movable shaft (19) and the threaded sleeve (17) are connected in a threaded manner, and the right end of the movable shaft (19) is connected to a clamping hole (22) on the surface of the cover seat (2) through a clamping strip (21) to form a clamping sliding connection.

7. The oil seal chamber pressure reduction structure for a screw compressor according to claim 1, characterized in that: The middle part of the movable shaft (19) is arranged in a hollow shape, and pressure relief holes (20) are evenly arranged at the right end of the movable shaft (19).

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